Firing mechanism for automatic firearms.



K. A. BRAUNMIG. FIRING MECHANISM FOR AUTOMATIC FIREARMS. APPLICATION FILED JULY 16, 1912.

1,073,588, Patented Sept. 23, 1913.

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K. A. BRA'UNING. FIRING MECHANISM FOR AUTOMATIC FIREARMS.

APPLICATION FILED JULY 16, 1912,

Patented Sept. 23, 1913] Inwentor:

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K. A. BRAUNING.

FIRING MECHANISM FOR AUTOMATIC FIREARMS. APPLIOA'I'ION FILED JULY 16, 1912.

Patented Sept. 23, 1913.

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Kan-L AUGUST BRALUNING, or ranns'rat, B

FIiKINQ-r MECHANISM FOR AUTOMATIC FIflE-ARMS.

1&7 3,5558; Specification of Application filed July 16,

To all whom z't may concern:

Be it known that I, KABL Aucusr Built 7- MNG, a subject of the Emperor oi Germany, and resident of Herstal, in the Kingdom oi Belgium, have invented certaii'i new and use; tul Improvements in Firing Mechanism for Automatic Firearms; and I do hereby declare the following to be a full, clear, and exact description of the'invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or-figures of reference marked therein, which form a part of this specification. 4

i The-present invention relates to a firing mechanism for automatic firearms in which ?atented Sept. 3, 1913.

1912. Serial No. 709,811.

Letters Tatent.

molly depressed by the spring. When the hammer l is cocked the sear 4. engages at 6 with the breech bolt 8. lVhen the sear 4, the upper part 36 of which enters into a corresponding groove 37 of the hammer, is raised. the abutment 6 is released and the freed hammer is carried forward and carries along the sear 4. which is then displaced in the groove 7 of the breech bolt. During this displacement, the lugs 38 of the abutment of the hammer slide along the surfaces 39 of the rear part of the breech bolt. in the position which it occupies after the forward movement, the abutment 25 rests against a part 26 which serves to recock the hammer. The two arms 27 of this part 26 are disposed on either side of the hammer and within the hollow part -10 of the breech bolt; the

the percussion bolt is provided with a part subjected to the action of a spring which part comprises the sear retains the percusion bolt or hammer in the cocked position by striking against a stop on the breech bolt, the firing being effected by releasing the engagement of the said part and the stop.

The invention relates particularly to the means serving for actuating the sear.

An embodiment of the invention as applied to an automatic gun is illustrated in which:

Figure 1 illustrates the parts when the gun is erady for firing. Fig. represents the parts during he recoil of the breech bolt and indicates how the hammer is cocked. Fig. 3 illustrates the position of the parts immediately after firing when the percussion bolt is again cocked by the automatic mechanism, but before the marksman has released the trigger. Fig. 4 is a section in line-A-B of Fig. 1. Figs. 5 and 6 are a vertical longitudinal section and a plan view respectively of the breech bolt. Fig. 7 is an elevation of the percussion hammer. Fig. 8 is a section in the line CD of Fig. 7, looking toward the left. Fig. 9 is a section in the lines E-F of Fig. 7 looking toward the right. Figs. 10 and 11 are detail views showing the member which cocks the hammer. Figs. 12, 13 and 14 show the sear which maintains the hammer cocked.

The hammer l is forced forward by-thespring 2 which bears at 35 on the abutment 25 on the hammer 1'. Pivotally mount/ad eu the hammer at 3- is eas er 4. the rear face of which is-engaged bythe spring 2 in suc h part 4 .andwhic pivots 28 of this part are positioned in the grooves 29 of the breech bolt. The two projections 30 of the part 26 abut against the corresponding lugs 31 of the walls of the breech-box or frame and compel this part 26 to-turn on its pivots 28 until the plane surfaces of the lugs 30 rest on the surfaces 39 of the lock. The ends of the arms 27 rest during this rotation against the abutment 25 of hammer 1 and thus cause the same to be displaced with respect to the breech bolt 8, against the action of the spring 2. When the part 26 has taken the position illustrated in Fig. 2', the sear 4 is released from groove 7 and takes the position shown at Fig. 2, in consequence of the action of spring 2 which rear against the bottom of a housing 32 attached to breech bolt 8. The breech bolt continues its recoil movement, the lugs sliding in the grooves 42 of the breech-box; subsequently, under the action of the recuperative spring 41, it retakes the position shown in Fig. 1. On the other hand, during the closing movement of the lock, lugs 30 of the part 26 abut against cause this piece 26 to retake its original position. During this time the hammer is not any more in contact with arms27 and advances until the sear 4 engages the lock at 6, while the lock passes from the position of Fig. 2 to the position of Fig. 3. The hammer 1 is then again recopked.

' This invention relates to the arrangement serving for lifting the h is of such a nature that manner that its nose or forward end is norit is possible to recock the percussion bolt the oblique lugs 34 of the breech-box and presses toward the morii particularly when the marksman has not released the trigger 9. This trigger 9 which is pivotally mounted on the frame is subjected to the action of a spring 11. The trigger carries a stud 14 which enters the fork 15 of a lever 16 and ends in front in a hook-like arm 17 which engages in an opening 18 in the lever 16. Rearwardly the opening 18 comprises a vertical face 23 which ends below in a rearwardly inclined face 24'. In the lever 16 a slot 19 is provided in which a shaft 20 rigidly connected with the frame engages. In front the lever 16 has a perpendicular arm 21 adapted to lift the part 4 by the intermediary of the nose 22.

Vi hen the parts assume the position illustrated in Fig. 1 and the trigger 9 is actu atcd, the rear part of the lever 16 is de pressed by the stud 14 and the arm 21 lifted against the nose 22 of the part 4. During this operation the book '17 alters its positien in front. of the vertical face 23 in such a n'ianner that it is quite impossible for the lever to move forward. On continuing to actuate the trigger 9 the arm 21 lifts the part and produces firing. During this t me the hook 1'? will have been lowered to h an extent that it brought in front the inclined face 24 and out of contact l fa v After firing the percussion original position, the nose mes lts 'l-tesi the arm 21 which is still niainta. raised and draws it forward into the position shown in Fig. 3 until the hdok 135 l? encounters the lower part of the inclined face QI. .Vhen the marksman re leases the trigger 9 the latter resumes its initial position under the influence of the spring 11 whereby the n ook 17 is lifted and ti a nose 21 depressed by the stud lit.

The action of the hook 17 on the incline:

face 5%: arries the lever .16 rearward whereby finally all the parts are returned' to the position shown in Fig. 1.

Claims: v

1. In a firing mechanism for automatic firearms, the combination of a percussion bolt, a pivotally mounted sear on the percussion bolt, a stop for said sear upon the breech belt, a sliding lever provided With an arm lifting this sear when firing, a trigger actuating this lever and means for disengaging the arm of said lever from the pivotally mounted sear by the action of the trigger, .at the moment at which it is released by the marksman. V j

In a firing mechanism for automatic firearms, the combination of a percussion bolt, a pivotally mounted scar on the percussion bolt adapted to engage with the breech bolt, a sliding lever provided with an ar a lifting said sear when firing, a trigger actuating said lever by means of a stud engaged between forks of the lever, and means for disengaging the arm of said lever from the pivotally mounted sear by the action of the trigger at the moment at which it is released by the marksman. I

3. In a firing mechanism for automatic firearms the combination of a percussion bolt,

a stop for said sear upon the breech a lever provided with an arm lifting said sear when'firing, a trigger actuating I said lever by means of a stud engaged b tween forks of t e lever, a nose of the trigbolt, bolt,

ger acting on an inclined face of the lever in such a manner that it disengages the, I levcr arm from the sear at the moment at which said trigger released by the marksman.

In testimony whereof I aflix my signature in presence of two witnesses.

KARL AU GUST BBAUNING. l-Vitnesses Lsoruim LOEL, v Gnomes Vixen HAIGHEN.

a se; r pivotally mounted on the percussion 

